Firefox 3.6 is no longer supported

Firefox 3.6.28 is the last version of the old Firefox and won't be updated with security and stability fixes. In order to keep your computer and personal information safe, we recommend that you install the latest Firefox if possible. This article goes over your upgrade options.

Note: Because old versions of Firefox leave your computer vulnerable, they will be updated to Firefox 12 automatically. If your computer is capable of running the latest Firefox, you will then be prompted to update again. For more information, see Firefox just updated - why is it asking me to update again?

The latest Firefox has many new features and looks a bit different from Firefox 3.6. After you upgrade, these articles will help you get comfortable with the changes:

Warning: Continuing to use Firefox 3.6 is no longer supported and poses a significant security risk.

Options for older versions of Windows

If at all possible you should avoid using these old Windows versions that are no longer supported by Microsoft.
Firefox 12 is the last version of Firefox that will work with Windows 2000, the original version of Windows XP or Windows XP Service Pack 1. If you use these versions of Windows you will have to update Windows in addition to Firefox in order to keep receiving security and stability fixes. For details and what to do if you can't upgrade, see:

Warning: Continuing to use Firefox 3.6 is no longer supported and poses a significant security risk.

Options for Mac OS 10.4, 10.5 or PowerPC processors

New versions of Firefox do not work with Mac OS X 10.4, 10.5 or with PowerPC processors. You will have to upgrade Mac OS or, more likely, get a newer computer in order to keep receiving security and stability fixes and run the latest Firefox. For details, see:

Options for Mac OS 10.4 or PowerPC processors

New versions of Firefox do not work with Mac OS X 10.4 or with PowerPC processors. You will have to upgrade Mac OS or, more likely, get a newer computer in order to keep receiving security and stability fixes and run the latest Firefox. For details, see:

Firefox 3.6.28 is the last version of the old Firefox and won't be updated with security and stability fixes. In order to keep your computer and personal information safe, we recommend that you install the latest Firefox.